example_erc20_gas/
handler.rs1use revm::{
2 context::Cfg,
3 context_interface::{result::HaltReason, Block, ContextTr, JournalTr, Transaction},
4 handler::{
5 pre_execution::{calculate_caller_fee, validate_account_nonce_and_code_with_components},
6 EvmTr, EvmTrError, FrameResult, FrameTr, Handler,
7 },
8 interpreter::interpreter_action::FrameInit,
9 primitives::{hardfork::SpecId, U256},
10 state::EvmState,
11};
12
13use crate::{erc_address_storage, TOKEN};
14
15#[derive(Debug)]
19pub struct Erc20MainnetHandler<EVM, ERROR, FRAME> {
20 _phantom: core::marker::PhantomData<(EVM, ERROR, FRAME)>,
21}
22
23impl<CTX, ERROR, FRAME> Erc20MainnetHandler<CTX, ERROR, FRAME> {
24 pub fn new() -> Self {
26 Self {
27 _phantom: core::marker::PhantomData,
28 }
29 }
30}
31
32impl<EVM, ERROR, FRAME> Default for Erc20MainnetHandler<EVM, ERROR, FRAME> {
33 fn default() -> Self {
34 Self::new()
35 }
36}
37
38impl<EVM, ERROR, FRAME> Handler for Erc20MainnetHandler<EVM, ERROR, FRAME>
39where
40 EVM: EvmTr<Context: ContextTr<Journal: JournalTr<State = EvmState>>, Frame = FRAME>,
41 FRAME: FrameTr<FrameResult = FrameResult, FrameInit = FrameInit>,
42 ERROR: EvmTrError<EVM>,
43{
44 type Evm = EVM;
45 type Error = ERROR;
46 type HaltReason = HaltReason;
47
48 fn validate_against_state_and_deduct_caller(&self, evm: &mut Self::Evm) -> Result<(), ERROR> {
49 let (block, tx, cfg, journal, _, _) = evm.ctx_mut().all_mut();
50
51 journal.load_account_mut(TOKEN)?.touch();
53
54 let mut caller_account = journal.load_account_with_code_mut(tx.caller())?;
56
57 validate_account_nonce_and_code_with_components(&caller_account.info, tx, cfg)?;
58
59 caller_account.touch();
61 if tx.kind().is_call() {
62 caller_account.bump_nonce();
63 }
64
65 let account_balance_slot = erc_address_storage(tx.caller());
66
67 let account_balance = journal.sload(TOKEN, account_balance_slot)?.data;
69
70 let new_balance = calculate_caller_fee(account_balance, tx, block, cfg)?;
71
72 journal.sstore(TOKEN, account_balance_slot, new_balance)?;
74
75 Ok(())
76 }
77
78 fn reimburse_caller(
79 &self,
80 evm: &mut Self::Evm,
81 exec_result: &mut <<Self::Evm as EvmTr>::Frame as FrameTr>::FrameResult,
82 ) -> Result<(), Self::Error> {
83 let context = evm.ctx();
84 let basefee = context.block().basefee() as u128;
85 let caller = context.tx().caller();
86 let effective_gas_price = context.tx().effective_gas_price(basefee);
87 let gas = exec_result.gas();
88
89 let reimbursement =
90 effective_gas_price.saturating_mul((gas.remaining() + gas.refunded() as u64) as u128);
91
92 let account_balance_slot = erc_address_storage(caller);
93
94 let account_balance = context
96 .journal_mut()
97 .sload(TOKEN, account_balance_slot)?
98 .data;
99
100 context.journal_mut().sstore(
102 TOKEN,
103 account_balance_slot,
104 account_balance + U256::from(reimbursement),
105 )?;
106
107 Ok(())
108 }
109
110 fn reward_beneficiary(
111 &self,
112 evm: &mut Self::Evm,
113 exec_result: &mut <<Self::Evm as EvmTr>::Frame as FrameTr>::FrameResult,
114 ) -> Result<(), Self::Error> {
115 let context = evm.ctx();
116 let tx = context.tx();
117 let beneficiary = context.block().beneficiary();
118 let basefee = context.block().basefee() as u128;
119 let effective_gas_price = tx.effective_gas_price(basefee);
120 let gas = exec_result.gas();
121
122 let coinbase_gas_price = if context.cfg().spec().into().is_enabled_in(SpecId::LONDON) {
123 effective_gas_price.saturating_sub(basefee)
124 } else {
125 effective_gas_price
126 };
127
128 let reward = coinbase_gas_price.saturating_mul(gas.used() as u128);
129
130 let beneficiary_slot = erc_address_storage(beneficiary);
131 let journal = context.journal_mut();
133 let beneficiary_balance = journal.sload(TOKEN, beneficiary_slot)?.data;
134 journal.sstore(
136 TOKEN,
137 beneficiary_slot,
138 beneficiary_balance + U256::from(reward),
139 )?;
140
141 Ok(())
142 }
143}